How to evaluate a deal with 0% down

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I'm wondering how you tell if you have a good deal if it is financed using a VA home loan (0% down). The numbers are very different on a property that is 80% financed and 100% financed. Especially when multi family properties in Miami start at around 300k. At 100% financed the property does not cash flow, the one I'm looking at now is at -$50 WITH me living in it, but at 20% down it cash flows around $240, with me living in it for "free". When I move out it will cash flow slightly better.